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a₂=x-r
a₃=x
a₄=x+r
a₅=x+2r
x-2r+x-r+x+x_r+x+2r=100
x=20
1/7(x-2r+x-r+x)=x+r+x+2r /•7
-220=24r
r=-9⅙
a₁=38⅓
a₂=29⅙
a₃=20
a₄=10 5/6
a₅=1⅔